Abstract
In the present study, struvite decomposition was performed by air stripping for ammonia release and a novel integrated reactor was designed for the simultaneous removal and recovery of total ammonia-nitrogen (TAN) and total orthophosphate (PT) from swine wastewater by internal struvite recycling. Decomposition of struvite by air stripping was found to be feasible. Without supplementation with additional magnesium and phosphate sources, the removal ratio of TAN from synthetic wastewater was maintained at >80% by recycling of the struvite decomposition product formed under optimal conditions, six times. Continuous operation of the integrated reactor indicated that approximately 91% TAN and 97% PT in the swine wastewater could be removed and recovered by the proposed recycling process with the supplementation of bittern. Economic evaluation of the proposed system showed that struvite precipitation cost can be saved by approximately 54% by adopting the proposed recycling process in comparison with no recycling method.
Highlights
In the present study, struvite decomposition was performed by air stripping for ammonia release and a novel integrated reactor was designed for the simultaneous removal and recovery of total ammonia-nitrogen (TAN) and total orthophosphate (PT) from swine wastewater by internal struvite recycling
Nitrogen (N) and phosphorus (P) are the essential elements for the synthesis of nucleic acids and proteins, which are the two most important polymers of life[1]. The presence of these elements in substantial quantities in the receiving water body triggers eutrophication, which results in accelerated depletion of dissolved oxygen in the water body and thereby increasing toxicity to the aquatic life
Disregarding the costs of energy consumption and the associated manpower, the expenditure involved in struvite precipitation for total ammonia nitrogen (TAN) removal includes three costs of magnesium and phosphate sources and that of sodium hydroxide (NaOH)
Summary
Struvite decomposition was performed by air stripping for ammonia release and a novel integrated reactor was designed for the simultaneous removal and recovery of total ammonia-nitrogen (TAN) and total orthophosphate (PT) from swine wastewater by internal struvite recycling. Without supplementation with additional magnesium and phosphate sources, the removal ratio of TAN from synthetic wastewater was maintained at >80% by recycling of the struvite decomposition product formed under optimal conditions, six times. N and P are mainly derived in the water environment from the industrial discharge and municipal wastewaters Among these wastewaters, swine wastewater simultaneously contains high concentrations of total ammonia nitrogen (TAN) and total orthophosphate (PT). Swine wastewater simultaneously contains high concentrations of total ammonia nitrogen (TAN) and total orthophosphate (PT) Disposal of such inadequately treated wastewater may cause serious environment issues.
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